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Revenue - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |
Remaining performance obligations recognition period | 12 months |
Accounts and notes receivable | $ 786,145 | $ 535,176
Accounts receivable held for sale | 15,434 | 34,744
Deferred revenue and student deposits, current | 675,455 | 312,422
Revenue recognized | 217,000 |
Capitalized contract cost | 5,179 | 0
Capitalized contract cost, accumulated amortization | 646 | 0
Amortization of capitalized costs | 646 |
Disposal Group, Held-for-sale, Not Discontinued Operations |  |
Disaggregation of Revenue [Line Items] |  |
Deferred revenue and student deposits | $ 46,335 | $ 94,951
Minimum |  |
Disaggregation of Revenue [Line Items] |  |
Contract cost, amortization period | 2 years |
Maximum |  |
Disaggregation of Revenue [Line Items] |  |
Contract cost, amortization period | 4 years |

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- Definition The aggregate of amounts due from customers or clients, within one year of the balance sheet date (or one operating cycle, if longer), for goods or services that have been delivered or sold in the normal course of business and an amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date within one year of the balance sheet, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection and net of any write-downs taken for collection uncertainty on the part of the holder, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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